
direkt
direct
Spatial: by the shortest route, without detours.
Es gibt einen direkten Flug von Frankfurt nach New York.
There is a direct flight from Frankfurt to New York.
direct
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direct
Spatial: by the shortest route, without detours.
Es gibt einen direkten Flug von Frankfurt nach New York.
There is a direct flight from Frankfurt to New York.

immediately
Temporal: immediately, without delay.
Bitte ruf mich direkt nach deiner Ankunft an.
Please call me immediately after you arrive.

direct
Interpersonal: open and honest, without beating around the bush.
Sie ist für ihre direkte Art bekannt und sagt immer, was sie denkt.
She is known for her direct manner and always says what she thinks.

direct
Describes an immediate connection or effect without intermediate steps.
Die neuen Gesetze haben eine direkte Auswirkung auf unser Geschäft.
The new laws have a direct impact on our business.

downright
Used colloquially as an intensifier and means 'geradezu' (downright) or 'regelrecht' (positively/absolutely).
Seine Reaktion war direkt feindselig.
His reaction was downright hostile.
'Direkt' can stand before a noun as an adjective and is then declined. But it can also be used as an adverb to describe a verb, an adjective, or a preposition, and then it remains unchanged.
Wir haben eine direkte Verbindung ohne Umsteigen.
We have a direct connection with no transfers.
You can often recognize the spatial meaning from combinations with places or prepositions of location. Typical phrases are 'direkt vor' (directly in front of), 'direkt neben' (right next to), or 'direkt am' (directly at/on).
Die Apotheke befindet sich direkt gegenüber vom Bahnhof.
The pharmacy is located directly across from the train station.
When 'direkt' has a temporal meaning, it often appears in connection with time expressions or events. A very common combination is 'direkt nach' (immediately after).
Ich rufe dich direkt nach der Konferenz zurück.
I'll call you back immediately after the conference.
In interpersonal contexts, 'direkt' describes open communication. Common combinations are 'eine direkte Frage' (a direct question), 'eine direkte Antwort' (a direct answer), or 'eine direkte Art haben' (to have a direct manner).
Er hat mir eine sehr direkte Antwort auf meine Frage gegeben.
He gave me a very direct answer to my question.
To describe an immediate connection or consequence, 'direkt' is combined with abstract nouns. Typical examples are 'direkter Einfluss' (direct influence), 'direkte Folge' (direct consequence), or 'direkter Zusammenhang' (direct connection).
Es gibt einen direkten Zusammenhang zwischen den beiden Ereignissen.
There is a direct connection between the two events.
In colloquial speech, 'direkt' is used as an intensifying adverb in the sense of 'geradezu' (downright) or 'regelrecht' (positively/absolutely). This use is informal and should be avoided in formal texts.
Das war direkt unhöflich, wie er geantwortet hat.
That was downright rude, the way he answered.
immediately
Direkt and sofort can both mean that something happens without delay. Sofort clearly refers to the timing. Direkt can also have a temporal meaning, but depending on the context it can mean other things as well; for a clear request to do something without delay, sofort is especially suitable.

Nach dem Gespräch rufe ich dich direkt an.
I’ll call you directly after the conversation.
Nach dem Gespräch rufe ich dich sofort an.
I’ll call you immediately after the conversation.